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114 114

First Observation of the Cabibbo-suppressed Decays Xi_c+ -> Sigma+ pi- pi+ and Xi_c+ -> Sigma- pi+ pi+ and Measurement of their Branching Ratios

Jul 20, 2013 07/13

by SELEX Collaboration; E. Vazquez-Jauregui; J. Engelfried

eye 114

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We report the first observation of two Cabibbo-suppressed decay modes, Xi_c+ -> Sigma+ pi- pi+ and Xi_c+ -> Sigma- pi+ pi+. We observe 59+/-14 over a background of 87, and 22+/-8 over a background of 13 events, respectively, for the signals. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600GeV/c Sigma- beam. The branching ratios of the decays relative to the Cabibbo--favored Xi_c+ -> Xi- pi+ pi+ are measured to...
Source: http://arxiv.org/abs/0804.2298v2

Arxiv.org

52 52

Activities of γ-ray emitting isotopes in rainwater from Greater Sudbury, Canada following the Fukushima incident

Sep 18, 2013 09/13

by B. T. Cleveland; F. A. Duncan; I. T. Lawson; N. J. T. Smith; E. Vazquez-Jauregui

eye 52

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We report the activity measured in rainwater samples collected in the Greater Sudbury area of eastern Canada on 3, 16, 20, and 26 April 2011. The samples were gamma-ray counted in a germanium detector and the isotopes 131I and 137Cs, produced by the fission of 235U, and 134Cs, produced by neutron capture on 133Cs, were observed at elevated levels compared to a reference sample of ice-water. These elevated activities are ascribed to the accident at the Fukushima Dai-ichi nuclear reactor complex...
Source: http://arxiv.org/abs/1201.3970v2

Arxiv.org

71 71

First dark matter search results from a 4-kg CF$_3$I bubble chamber operated in a deep underground site

Sep 21, 2013 09/13

by E. Behnke; J. Behnke; S. J. Brice; D. Broemmelsiek; J. I. Collar; A. Conner; P. S. Cooper; M. Crisler; C. E. Dahl; D. Fustin; E. Grace; J. Hall; M. Hu; I. Levine; W. H. Lippincott; T. Moan; T. Nania; E. Ramberg; A. E. Robinson; A. Sonnenschein; M. Szydagis; E. Vázquez-Jáuregui

eye 71

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New data are reported from the operation of a 4.0 kg CF$_{3}$I bubble chamber in the 6800-foot-deep SNOLAB underground laboratory. The effectiveness of ultrasound analysis in discriminating alpha-decay background events from single nuclear recoils has been confirmed, with a lower bound of $>$99.3% rejection of alpha-decay events. Twenty single nuclear recoil event candidates and three multiple bubble events were observed during a total exposure of 553 kg-days distributed over three different...
Source: http://arxiv.org/abs/1204.3094v2

Arxiv.org

143 143

Direct Measurement of the Bubble Nucleation Energy Threshold in a CF3I Bubble Chamber

Jul 20, 2013 07/13

by COUPP Collaboration; E. Behnke; T. Benjamin; S. J. Brice; D. Broemmelsiek; J. I. Collar; P. S. Cooper; M. Crisler; C. E. Dahl; D. Fustin; J. Hall; C. Harnish; I. Levine; W. H. Lippincott; T. Moan; T. Nania; R. Neilson; E. Ramberg; A. E. Robinson; A. Sonnenschein; E. Vázquez-Jáuregui; R. A. Rivera; L. Uplegger

eye 143

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We have directly measured the energy threshold and efficiency for bubble nucleation from iodine recoils in a CF3I bubble chamber in the energy range of interest for a dark matter search. These interactions cannot be probed by standard neutron calibration methods, so we develop a new technique by observing the elastic scattering of 12 GeV/c negative pions. The pions are tracked with a silicon pixel telescope and the reconstructed scattering angle provides a measure of the nuclear recoil kinetic...
Source: http://arxiv.org/abs/1304.6001v1

Arxiv.org

61 61

Radon backgrounds in the DEAP-1 liquid-argon-based Dark Matter detector

Sep 18, 2013 09/13

by P. -A. Amaudruz; M. Batygov; B. Beltran; K. Boudjemline; M. G. Boulay B. Cai T. Caldwell; M. Chen; R. Chouinard; B. T. Cleveland; D. Contreras; K. Dering; F. Duncan; R. Ford; R. Gagnon F. Giuliani; M. Gold V. V. Golovko; P. Gorel; K. Graham; D. R. Grant; R. Hakobyan; A. L. Hallin; P. Harvey; C. Hearns; C. J. Jillings; M. Kuźniak; I. Lawson; O. Li; J. Lidgard; P. Liimatainen; W. H. Lippincott; R. Mathew; A. B. McDonald; T. McElroy; K. McFarlane; D. McKinsey; A. Muir; C. Nantais; K. Nicolics; J....

eye 61

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The DEAP-1 \SI{7}{kg} single phase liquid argon scintillation detector was operated underground at SNOLAB in order to test the techniques and measure the backgrounds inherent to single phase detection, in support of the \mbox{DEAP-3600} Dark Matter detector. Backgrounds in DEAP are controlled through material selection, construction techniques, pulse shape discrimination and event reconstruction. This report details the analysis of background events observed in three iterations of the DEAP-1...
Source: http://arxiv.org/abs/1211.0909v2

Arxiv.org

5 5.0

DEAP-3600 Dark Matter Search

Jun 30, 2018 06/18

by DEAP Collaboration; P. -A. Amaudruz; M. Batygov; B. Beltran; J. Bonatt; M. G. Boulay; B. Broerman; J. F. Bueno; A. Butcher; B. Cai; M. Chen; R. Chouinard; B. T. Cleveland; K. Dering; J. DiGioseffo; F. Duncan; T. Flower; R. Ford; P. Giampa; P. Gorel; K. Graham; D. R. Grant; E. Guliyev; A. L. Hallin; M. Hamstra; P. Harvey; C. J. Jillings; M. Kuźniak; I. Lawson; O. Li; P. Liimatainen; P. Majewski; A. B. McDonald; T. McElroy; K. McFarlane; J. Monroe; A. Muir; C. Nantais; C. Ng; A. J. Noble; C....

eye 5

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The DEAP-3600 experiment is located 2 km underground at SNOLAB, in Sudbury, Ontario. It is a single-phase detector that searches for dark matter particle interactions within a 1000-kg fiducial mass target of liquid argon. A first generation prototype detector (DEAP-1) with a 7-kg liquid argon target mass demonstrated a high level of pulse-shape discrimination (PSD) for reducing $\beta$/$\gamma$ backgrounds and helped to develop low radioactivity techniques to mitigate surface-related $\alpha$...
Topics: Physics, Astrophysics, Cosmology and Nongalactic Astrophysics, High Energy Physics - Experiment,...
Source: http://arxiv.org/abs/1410.7673

Arxiv.org

22 22

Dark Matter Search Results from the PICO-2L C$_3$F$_8$ Bubble Chamber

Jun 27, 2018 06/18

by C. Amole; M. Ardid; D. M. Asner; D. Baxter; E. Behnke; P. Bhattacharjee; H. Borsodi; M. Bou-Cabo; S. J. Brice; D. Broemmelsiek; K. Clark; J. I. Collar; P. S. Cooper; M. Crisler; C. E. Dahl; S. Daley; M. Das; F. Debris; N. Dhungana; J. Farine; I. Felis; R. Filgas; M. Fines-Neuschild; F. Girard; G. Giroux; M. Hai; J. Hall; O. Harris; C. M. Jackson; M. Jin; C. B. Krauss; M. Lafrenière; M. Laurin; I. Lawson; I. Levine; W. H. Lippincott; E. Mann; J. P. Martin; D. Maurya; P. Mitra; R. Neilson; A. J....

eye 22

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New data are reported from the operation of a 2-liter C$_3$F$_8$ bubble chamber in the 2100 meter deep SNOLAB underground laboratory, with a total exposure of 211.5 kg-days at four different recoil energy thresholds ranging from 3.2 keV to 8.1 keV. These data show that C3F8 provides excellent electron recoil and alpha rejection capabilities at very low thresholds, including the first observation of a dependence of acoustic signal on alpha energy. Twelve single nuclear recoil event candidates...
Topics: Instrumentation and Detectors, Astrophysics, Physics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1503.00008

Arxiv.org

4 4.0

Dark Matter Search Results from the PICO-60 CF$_3$I Bubble Chamber

Jun 28, 2018 06/18

by C. Amole; M. Ardid; D. M. Asner; D. Baxter; E. Behnke; P. Bhattacharjee; H. Borsodi; M. Bou-Cabo; S. J. Brice; D. Broemmelsiek; K. Clark; J. I. Collar; P. S. Cooper; M. Crisler; C. E. Dahl; S. Daley; M. Das; F. Debris; N. Dhungana; J. Farine; I. Felis; R. Filgas; F. Girard; G. Giroux; A. Grandison; M. Hai; J. Hall; O. Harris; M. Jin; C. B. Krauss; S. Fallows; M. Lafrenière; M. Laurin; I. Lawson; I. Levine; W. H. Lippincott; E. Mann; D. Maurya; P. Mitra; R. Neilson; A. J. Noble; A. Plante; R....

eye 4

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New data are reported from the operation of the PICO-60 dark matter detector, a bubble chamber filled with 36.8 kg of CF$_3$I and located in the SNOLAB underground laboratory. PICO-60 is the largest bubble chamber to search for dark matter to date. With an analyzed exposure of 92.8 livedays, PICO-60 exhibits the same excellent background rejection observed in smaller bubble chambers. Alpha decays in PICO-60 exhibit frequency-dependent acoustic calorimetry, similar but not identical to that...
Topics: High Energy Physics - Experiment, Cosmology and Nongalactic Astrophysics, Astrophysics,...
Source: http://arxiv.org/abs/1510.07754

Arxiv.org

5 5.0

Improved dark matter search results from PICO-2L Run 2

Jun 29, 2018 06/18

by C. Amole; M. Ardid; I. J. Arnquist; D. M. Asner; D. Baxter; E. Behnke; P. Bhattacharjee; H. Borsodi; M. Bou-Cabo; S. J. Brice; D. Broemmelsiek; K. Clark; J. I. Collar; P. S. Cooper; M. Crisler; C. E. Dahl; M. Das; F. Debris; S. Fallows; J. Farine; I. Felis; R. Filgas; M. Fines-Neuschild; F. Girard; G. Giroux; J. Hall; O. Harris; E. W. Hoppe; C. M. Jackson; M. Jin; C. B. Krauss; M. Lafrenière; M. Laurin; I. Lawson; A. Leblanc; I. Levine; W. H. Lippincott; E. Mann; J. P. Martin; D. Maurya; P....

eye 5

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New data are reported from a second run of the 2-liter PICO-2L C$_3$F$_8$ bubble chamber with a total exposure of 129$\,$kg-days at a thermodynamic threshold energy of 3.3$\,$keV. These data show that measures taken to control particulate contamination in the superheated fluid resulted in the absence of the anomalous background events observed in the first run of this bubble chamber. One single nuclear-recoil event was observed in the data, consistent both with the predicted background rate...
Topics: Astrophysics, Cosmology and Nongalactic Astrophysics, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1601.03729

Arxiv.org

3 3.0

Improving Photoelectron Counting and Particle Identification in Scintillation Detectors with Bayesian Techniques

Jun 30, 2018 06/18

by M. Akashi-Ronquest; P. -A. Amaudruz; M. Batygov; B. Beltran; M. Bodmer; M. G. Boulay; B. Broerman; B. Buck; A. Butcher; B. Cai; T. Caldwell; M. Chen; Y. Chen; B. Cleveland; K. Coakley; K. Dering; F. A. Duncan; J. A. Formaggio; R. Gagnon; D. Gastler; F. Giuliani; M. Gold; V. V. Golovko; P. Gorel; K. Graham; E. Grace; N. Guerrero; V. Guiseppe; A. L. Hallin; P. Harvey; C. Hearns; R. Henning; A. Hime; J. Hofgartner; S. Jaditz; C. J. Jillings; C. Kachulis; E. Kearns; J. Kelsey; J. R. Klein; M....

eye 3

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Many current and future dark matter and neutrino detectors are designed to measure scintillation light with a large array of photomultiplier tubes (PMTs). The energy resolution and particle identification capabilities of these detectors depend in part on the ability to accurately identify individual photoelectrons in PMT waveforms despite large variability in pulse amplitudes and pulse pileup. We describe a Bayesian technique that can identify the times of individual photoelectrons in a sampled...
Topics: Physics, Astrophysics, High Energy Physics - Experiment, Nuclear Experiment, Instrumentation and...
Source: http://arxiv.org/abs/1408.1914

Arxiv.org

21 21

The transverse momentum dependence of charged kaon Bose-Einstein correlations in the SELEX experiment

Jun 26, 2018 06/18

by SELEX Collaboration; G. A. Nigmatkulov; A. K. Ponosov; U. Akgun; G. Alkhazov; J. Amaro-Reyes; A. Asratyan; A. G. Atamantchouk; A. S. Ayan; M. Y. Balatz; A. Blanco-Covarrubias; A. A. Vorobyov; K. Vorwalter; J. You; R. Zukanovich-Funchal; N. F. Bondar; P. S. Cooper; L. J. Dauwe; G. V. Davidenko; U. Dersch; A. G. Dolgolenko; G. B. Dzyubenko; R. Edelstein; L. Emediato; A. M. F. Endler; J. Engelfried; I. Eschrich; C. O. Escobar; N. Estrada; A. V. Evdokimov; I. S. Filimonov; A. Flores-Castillo; F. G....

eye 21

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We report on the measurement of the one-dimensional charged kaon correlation functions using 600~GeV/{\it c} $\Sigma^-$, $\pi^-$ and 540~GeV/{\it c} $p$ beams from the SELEX~(E781) experiment at the Fermilab Tevatron. $K^{\pm}K^{\pm}$ correlation functions are studied for three transverse pair momentum, $k_T$, ranges and parameterized by a Gaussian form. The emission source radii, $R$, and the correlation strength, $\lambda$, are extracted. The analysis shows a decrease of the source radii with...
Topics: Nuclear Experiment, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1501.04316

Arxiv.org

31 31

Current Status and Future Prospects of the SNO+ Experiment

Jun 28, 2018 06/18

by SNO+ Collaboration; :; S. Andringa; E. Arushanova; S. Asahi; M. Askins; D. J. Auty; A. R. Back; Z. Barnard; N. Barros; E. W. Beier; E. Mony; M. J. Mottram; V. Novikov; H. M. O'Keeffe; E. O'Sullivan; G. D. Orebi Gann; M. J. Parnell; S. J. M. Peeters; T. Pershing; Z. Petriw; A. Bialek; G. Prior; J. C. Prouty; S. Quirk; A. Reichold; A. Robertson; J. Rose; R. Rosero; P. M. Rost; J. Rumleskie; M. A. Schumaker; S. D. Biller; M. H. Schwendener; D. Scislowski; J. Secrest; M. Seddighin; L. Segui; S....

eye 31

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SNO+ is a large liquid scintillator-based experiment located 2km underground at SNOLAB, Sudbury, Canada. It reuses the Sudbury Neutrino Observatory detector, consisting of a 12m diameter acrylic vessel which will be filled with about 780 tonnes of ultra-pure liquid scintillator. Designed as a multipurpose neutrino experiment, the primary goal of SNO+ is a search for the neutrinoless double-beta decay (0$\nu\beta\beta$) of 130Te. In Phase I, the detector will be loaded with 0.3% natural...
Topics: Instrumentation and Detectors, Physics, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1508.05759

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